148
MacLane, S., 1988, Concepts and Categories in Perspective, in A Century of Mathematics in America, Part I, Providence: AMS, 323–365.

149
MacLane, S., 1989, The Development of Mathematical Ideas by Collision: the Case of Categories and Topos Theory, in Categorical Topology and its Relation to Analysis, Algebra and Combinatorics, Teaneck: World Scientific, 1–9.

150
Maclane, S. and I. Moerdijk : Sheaves in Geometry and Logic – A first Introduction to Topos Theory, Springer Verlag, New York
1992.